Our Earthly Map on the Sky

1
The CelestialSphere

• Our Earthly Map on the Sky

2
Earthly Coordinates
North Pole
N
W
E
S
Our Astronomer is in the northern hemisphere
(like us) and wants to devise a quick way to find
objects and events on the sky.
South Pole
3
Move the Coordinates Out!
North Circumpole
Celestial Equator
The Night Sky Celestial Sphere
Eq.
Take the coordinates we have an understanding
about and project them onto the night sky.
South Circumpole
4
Add Important Events
N.C.P.

• Now we begin to look for objects, important
  events, and observations to add to the celestial
  sphere.
• Where is the Sun?
• What date is it?
• How are objects moving?

C.E.
S.C.P.
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What happens during the year?
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The Celestial Sphere is Complete!
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Suns Path Winter Solstice
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Suns Path Vernal Equinox
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Suns Path Summer Solstice
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